4"

The 4" Febco 805 double check valve assembly began production in 19793 and quickly discontinued and replaced by the 805Y model. The original 805 had screw in covers and a bronze body with non removable check seat. Repair parts are no longer available for the original 805 backflow preventers.

The 4" Febco 805Y double check valve assembly began production in 1973 and was discontinued in 1988. The 805Y was replaced with the 805YD. The body is painted epoxy coated cast iron. Internal check parts were constructed of epoxy coated cast iron. Early production models featured check assemblies constructed of aluminum. The aluminum was quickly discontinued due to corrosion issues. Check seats were replaceable but a special seat removal tool is required. The bronze check assemblies and seats have been discontinued, but the newer stainless steel check assembly is a direct replacement.

The 4" Febco 805YD double check valve assembly began production in 1988 and was discontinued in 2008. The early bodies were painted epoxy coated ductile iron and after 1991, the body was constructed of fused epoxy coated ductile iron. Internal check parts were constructed of stainless steel. Check seats were constructed of bronze and replaceable. No special tools are required for servicing.

The 4" Febco 806YD double check detector assembly began production in 1988 and was discontinued in 2013. The early bodies were painted epoxy coated ductile iron and after 1991, the body was constructed of fused epoxy coated ductile iron. Internal check parts were constructed of stainless steel. Check seats were constructed of bronze and replaceable. The bypass device shall be a 3/4" Febco 805Y or 3/4" Febco 805YB. No special tools are required for servicing.

The 4" Febco 825 Series Reduced Pressure Zone Assemblies was produced from 1975 to 1988. It was replaced by the 825D. The original 825 models were constructed of cast iron and brush epoxy coated. Early models featured aluminum check assemblies but due to severe corrosion issues, they were converted to epoxy coated iron checks. Check seats were replaceable but are not longer available. A special seat removal tool was required to change seats. The relief valve is a side mount, bronze body with external sensing line. The relief valve body was changed in the newer models and parts do not interchange. A newer relief valve can be retrofitted to the older style device with the conversion kit. New stainless check assemblies will fit in the original 825 device.

The 4" Febco 825D Series Reduced Pressure Zone Assemblies was produced from 1988 to 1989. The 825D replaced the original 825, but had a short production run and was in turn replaced by the 825YD. The 825D model changes were a ductile iron body instead of a cast iron body and check assemblies were changed from epoxy coated iron to stainless steel. Check seats were replaceable but are not longer available. The relief valve is a side mount, bronze body with external sensing line. The relief valve body was changed in the newer models and parts do not interchange. A newer relief valve can be retrofitted to the older style device with the conversion kit.

The 4" Febco 825YD Series Reduced Pressure Zone Assemblies was produced from 1989 to 2013. The 825YD replaced the 825D. The 825YD is similar to the 825D but the relief valve design was changed. Relief valve parts do not interchange between the 825YD and the older models. The relief valve is a side mount, bronze body with external sensing line. A newer relief valve can be retrofitted to the older style device with the conversion kit. The early 825YD bodies (1989-1991) were epoxy painted ductile iron, and the later bodies were fused epoxy coated ductile iron. Check assemblies were made of stainless steel. Bronze, replaceable seats bolt into the body.

The 4" Febco 826YD Series Reduced Pressure Detector Assemblies were produced from 1989 to 2013. The 826YD is a fused epoxy coated, ductile iron device with stainless steel check assemblies. Bronze, replaceable seats bolt into the body. The relief valve is a side mount, bronze body with external sensing line. Bypass device shoud be a 3/4" Febco 825Y.

The 4" Febco 850 Series began production in 1993 and was discontinued in 2014. The 850 was replaced by the LF850 which is the lead free version to meet new nation wide codes. Known as the "Master Series" the 850 is constructed of epoxy coated ductile iron with bronze check assemblies. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. In 2010, the lead free version, 850LF was introduced. The "leaded" and "lead free" models use the same repair parts. No special tools are required for servicing.

The 4" Febco LF850 Series began production in 2010 and was introduced to replace the original 850 models. The LF850 is the lead free version to meet new nation wide codes. Known as the "Master Series" the LF850 is constructed of epoxy coated ductile iron with bronze check assemblies. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. No special tools are required for servicing.

The 4" Febco 856 Series double check detector assemblies began production in 1993 and was discontinued in 2014. The 856 was replaced by the 856ST which is the lead free version to meet new nation wide codes. Known as the "Master Series" the 856 is constructed of epoxy coated ductile iron with bronze check assemblies. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. Bypass assembiy shall be either 3/4" Febco 805Y or 3/4" 805YB. No special tools are required for servicing.

The 4" Febco LF856 Series double check detector assemblies began production in 2014. The LF856 replaced the 856ST. Known as the "Master Series" the LF856 is constructed of epoxy coated ductile iron with stainless steel internal parts. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. Parts do not interchange between LF856 and 856ST/856 models. Please be sure of your mdel before ordering parts. No special tools are required for servicing.

The 4" Febco 856ST Series double check detector assemblies began production in 2011 and was discontinued in 2014. The 856ST was replaced by the LF856. Known as the "Master Series" the 856ST is constructed of epoxy coated ductile iron. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. Bypass assembiy shall be 3/4" Watts 719. Parts do not interchange between 856ST and 856/LF856 models. Please be sure of your mdel before ordering parts. No special tools are required for servicing.

The 4" Febco 860 Reduced Pressure Zone (RPZ) backflow preventer was introduced in 1993 and was discontinued in 2013. The 860 was replaced by the LF860, which was introduced to comply with The lead free laws of 2014. Repair parts are diferent between the 860 and LF860. Known as Febcos "Master Series", the 860 feature a swing check design with bottom mounted relief valve. The body is constructed of epoxy coated ductile iron. The relief valve body is made of bronze. Modular style relief valve. Springs are self contained when covers are removed. No special tools are required for servicing.

The 4" Febco LF860 Reduced Pressure Zone (RPZ) backflow preventer was introduced in 2013 and is still currently produced. The LF860 replaced the 860 and was introduced to comply with The lead free laws of 2014. Repair parts are diferent between the 860 and LF860. Known as Febcos "Master Series", the LF860 feature a swing check design with bottom mounted relief valve. The body is constructed of epoxy coated ductile iron. Modular style relief valve. Springs are self contained when covers are removed. No special tools are required for servicing.